/Engine/Source/Editor/UnrealEd/Public/IProjectExternalContentInterface.h
Removes references to external content from the project and unloads the external content
void RemoveExternalContent ( TConstArrayView< [FString](API\Runtime\Core\Containers\FString) > ExternalContentIds, [FRemoveExternalContentComplete](API\Editor\UnrealEd\IProjectExternalContentInterface\FRemoveExternalC-) CompleteCallback )